Climatic and Tectonic-controlled terraces of the Kirmir Stream, Central Anatolia - Turkiye

Yıl 2023, , 114 - 136, 15.10.2023

Suzan Altıparmak , Uğur Doğan , Ali Koçyiğit , Serdar Yeşilyurt

https://doi.org/10.46453/jader.1332862

Öz

Kirmir Stream is a tributary of the Sakarya River, which drains the waters of the western part of the orogenic Central Anatolia Plateau. Kirmir Stream, which takes its source from the vicinity of Kızılcahamam, joins the Sakarya River to the southwest of Beypazarı. The Kirmir valley, which extends approximately E-W direction in the north of the Kırbaşı Plateau, is mainly controlled by faults. These faults have an important role in the asymmetry of the valley and on the some of terrace staircases. During our research in the Kirmir Stream Valley, 23 terrace staircases that preserved alluvial (channel, floodplain and alluvial fan) deposits were found. These terraces are distributed on the valley slopes at levels ranging from 5 m (T1) to 187 m (T23) above the current river level. Although the terrace staircases have not been dated yet, it can be said that these terraces are of middle-late Pleistocene age, considering that incising the valley of the Kirmir Stream concurrently with the Sakarya River for about 700 m in the last 4 Ma. This data also shows that the study area is affected by a rapid regional uplift compared to the central and southern parts of the Central Anatolia Plateau.

Anahtar Kelimeler

Kirmir Stream, fluvial geomorphology, tectonic geomorphology

Kirmir Çayı’nın İklim ve Tektonik Kontrollü Sekileri, İç Anadolu - Türkiye

Öz

Kirmir Çayı orojenik İç Anadolu Platosu’nun batı kısmının sularını toplayan Sakarya Nehri’nin bir koludur. Kaynağını Kızılcahamam yakınlarından alan Kirmir Çayı, Beypazarı’nın güneybatısında Sakarya Nehri’ne dahil olur. Kırbaşı Platosunun kuzeyinde yaklaşık olarak D-B uzanışlı olan Kirmir vadisi faylar tarafından kontrol edilmektedir. Bu faylar vadinin asimetrik olmasında ve bazı seki basamaklarının morfolojisi üzerinde önemli bir pay sahibidir. Kirmir Çayı vadisinde yaptığımız araştırmada eski alüvyon deposu korunmuş olan 23 seki basamağı saptanmıştır. Bu sekiler vadi yamaçlarında güncel nehir seviyesinden 5 m (T1) ile 187 m (T23) arasında değişen seviyelerde dağılış gösterir. Sekiler henüz tarihlendirilmemiş olmakla birlikte Kirmir Çayı’nın, Sakarya Nehri ile eş zamanlı olarak vadisini son 4 My’da yaklaşık 700 m kazdığı ve bu sekilerin orta-geç Pleyistosen yaşında oldukları söylenebilir. Bu veri aynı zamanda çalışma alanının İç Anadolu Platosunun orta ve güney kesimlerine göre hızlı bir bölgesel yükselmenin etkisinde kaldığını gösterir.

Anahtar Kelimeler

Kirmir Çayı, flüvyal jeomorfoloji, tektonik jeomorfoloji, seki

Kaynakça

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